lucene_list at iconparc
May 24, 2012, 8:48 AM
Post #3 of 5
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Re: ToParentBlockJoinQuery and grand-children
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Hello Mike,
thank you for your response. Unfortunately, I won't be able to try this
today, but I should be able to try it in the next few days. If I find
the bug you described, I will open an issue.
On a somewhat related note, is there a way to get the scores for the
parent documents from the ToParentBlockJoinCollector? I can tell the
collector to track the scores and the max score, but I did not find a
way to retrieve either the parent scores nor the max score (of the
parent documents).
Christoph Kaser
Am 23.05.2012 20:10, schrieb Michael McCandless:
> You do have to call getTopGroups for each grandchild query, and the
> order should match the TopGroups you got for the children
>
> However .... looking at the code, I suspect there's a bug... by the
> time the collector collects the parent hit, some of the grand children
> will have been discarded. I suspect you'll only get back
> grandchildren for the last child docID under each parent docID's
> group. Are you seeing that?
>
> Tricky... can you open an issue?
>
> Mike McCandless
>
> http://blog.mikemccandless.com
>
> On Wed, May 23, 2012 at 12:22 PM, Christoph Kaser
> <lucene_list [at] iconparc> wrote:
>> Hello,
>>
>> I would like to use the ToParentBlockJoinQuery and its collector to query a
>> document with children and grand children, but I can't figure out how to get
>> the document ids that represent grand children.
>>
>> I know how to build the query and get the parent and child documents:
>>
>>
>> /****Example code start*****/
>> Query grandChildQuery=new TermQuery(new Term("color", "red"));
>> Filter childFilter = new CachingWrapperFilter(new RawTermFilter(new
>> Term("type","child")), DeletesMode.IGNORE);
>> ToParentBlockJoinQuery grandchildJoinQuery = new
>> ToParentBlockJoinQuery(grandChildQuery, childFilter, ScoreMode.Max);
>>
>> BooleanQuery childQuery= new BooleanQuery();
>> childQuery.add(grandchildJoinQuery, Occur.MUST);
>> childQuery.add(new TermQuery(new Term("shape", "round")), Occur.MUST);
>>
>> Filter parentFilter = new CachingWrapperFilter(new RawTermFilter(new
>> Term("type","parent")), DeletesMode.IGNORE);
>> ToParentBlockJoinQuery childJoinQuery = new
>> ToParentBlockJoinQuery(childQuery, parentFilter, ScoreMode.Max);
>>
>> parentQuery=new BooleanQuery();
>> parentQuery.add(childJoinQuery, Occur.MUST);
>> parentQuery.add(new TermQuery(new Term("name", "test")), Occur.MUST);
>>
>> ToParentBlockJoinCollector parentCollector= new
>> ToParentBlockJoinCollector(Sort.RELEVANCE, 30, true, true);
>> searcher.search(parentQuery, null, parentCollector);
>> TopGroups<Integer> topGroups = parentCollector.getTopGroups(childJoinQuery,
>> null, 0, 20, 0, false);
>>
>> /****Example code end*****/
>>
>> Now topGroups contains the parents document ids, and the child document ids.
>> But how can I get the grandchild document ids for a given child document id?
>> Do I have to call
>>
>> TopGroups<Integer> childTopGroups =
>> parentCollector.getTopGroups(grandchildJoinQuery , null, 0, 20, 0, false);
>>
>> and match the document ids by hand? If so, is there a guarantee that they
>> will be in the same order as I get them in the topgroups, or will I have to
>> iterate over all childTopGroups until I find the right document id?
>>
>> Does anyone have example code for nested joins?
>>
>> Thanks in advance,
>> Christoph
>>
>>
>>
>>
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